We had this Asian friend who always began and ended every sentence he ever started with "damn ducd."

We laugh endlessly when we say this amongst ourselves, and it's picked up quite a bit of popularity.

Luckily when it came time to type this out over the internet the way you would spell "dude" and "ducd" is very similar, so it may look like a typo.
Other famous typos include, "teh" for "the" and so on.